Jose Leon was left unattended after school and wandered around Yonkers alone.Stephen Yang

An autistic student from Queens was found walking in the snow miles from the Yonkers school where he was receiving special education, more than 12 hours after he missed his bus last month and disappeared, according to a new lawsuit.

School officials lost track of 20-year-old Jose Leon even though a teacher and an assistant principal saw him leave the main entrance at 2:30 pm on Dec. 10, but did not see him get on the bus back to his Jackson Heights home, according to a police report.

The case is eerily similar to the tragedy involving Avonte Oquendo, the 14-year-old autistic boy who went missing for months after wandering away from his Long Island City school in October, 2013. Cops found his body in the East River three months later.

Jose Leon with his parents Jose and Gloria.Stephen Yang

Cops ultimately found Jose in Dobbs Ferry, six miles away from his Greenburgh Academy school in Yonkers, but not until 4:30 a.m. the next day when the temperature had dropped to near freezing.

“I didn’t know what to think or what to say,” Jose’s frightened mother, Gloria Leon told the Post. “I thought the world was coming to an end.”

A woman had called authorities and said she had found Jose alone, said Greenburgh Academy Superintendent Edward Placke.

She gave him a cup of tea and a chicken sandwich before taking him to a nearby hospital.

“He had a winter jacket on and was fine,” Placke said. “He came back two days later. He has done very well in the school.”

Placke said Jose likely got disoriented while walking with a group of students between the school building and the bus.

“He was, we believe, several yards from the bus,” Placke said. “We have a number of walkers, and two schools nearby. Apparently Jose got confused and started walking with a group of students. He ended up getting very disoriented.”

But the family’s lawyer, Gary Mayerson, said the school did not go far enough, particularly in the wake of the Oquendo tragedy.

“Taking care of an autistic child in a building is a responsibility you must have until the child is handed to a responsible adult on the outside,” said Mayerson. “That’s school safety 101.”

Leon’s mother said the Oquendo case was the first thing she thought of when the school called her. She said the city should add alarms to school doors,and improve staff training to make sure they can communicate better with disabled students.

“As a parent, you trust the Department of Education to take care of your children,” she said. “The last thing you think is that something will go wrong with your school.”

Lisa Goring, an executive at Autism Speaks, an advocacy group for families, said about half of autistic children are prone to wander, and that schools and parents should have strong measures in place to protect them.

“This is a very real risk,” Goring said. “Schools need to provide everyone in that building with training. That needs to be ongoing training and reinforced.”

US Sen. Charles Schumer is pushing for legislation to create and fund a program to provide voluntary tracking devices for autistic children. Schumer brought Avonte Oquendo’s mother, Vanessa Fontaine, to the State of the Union Tuesday as his guest.